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Vestibular Disorders (Diagnoses (Vestibular Schwannoma (Benign tumors of…

- - - - high firing rate (70-100/sec) enables excitation and inhbition to detect head motion
    - - Maintenance of eye position during rapid head movements via rapid compensatory opposite movements
      - VOR Gain - eye velocity in relation to head velocity; VOR Phase - amplitude of eye movement in relation to amplitude of head mvoement
      - Table 21.1 Inntervation pattern of excitatory input from the semicircular canals
    - - Use of direction of semicircular canals to interpret movement ie. if heads turns right, the right horizontal SCC will have increased firing rate and the left horizontal SCC will have decreased rate
    - - Causes sustaining of signal generated by cupula movement - purpose is to detect low-frequency head rotation
- - - - REtinal slip - blurred
    - - Table 21.8
  - - - Walking on different surfaces and environments
    - - Daily activity is necessary, even after discharge
- - - - Vertigo, Disequilibrium, Oscillopsia
    - - Ie. Vertigo lasting minutes suggests benign paroxysmal vertigo, while vertigo lasting hours suggests Meniere's disease, and vertigo lasting days suggests vestibular neuronitis or migraine-induced dizziness
  - - - Self-perceived handicap
      - Physical, Emotional, Functional domains
    - - Addresses avoidance behavior and quality of life
    - - Observation for Nystagmus
      - Head Impulse Test
        
        Corrective saccade indicates vestibular hypofunction
      - Head-shaking Induced Nystagmus Test
      - Positional Testing
        
        Dix-Hallpike Test for BPPV
      - Dynamic Visual Acuity Test
    - - Semicircular Canal testing
      - Otolith testing
      - Table 21.4 Tests and relevant diagnoses